Reflecting apparatus.



A. L. CROXTON.

REFLECTING APPARATUS.

APPLICATION FILED 1U,LY x-s. 1 915.

Patented Feb.19,191&

INVENTOR A L droxio/y W/ TNESSES:

ATTORNEY ALVYN L. CROXTON, 0F BREMEBTON, WASHINGTON.

REFLECTIN G APPARATUS.

Specification 01' Letters Patent.

Patented Feb. 19, 1918.

Application filed July 15, 1915. Serial N 0. 39,951.

To all whom it may concern Be it known that I, ALVYN L. CRoxToN, citizenof the United States, residing at Bremerton, in the county of Kitsap andState of Washington, have invented certain new and useful Improvementsin Reflecting Apparatus, of which the following is a spec1- fication.

The present invention relates to reflectmg apparatus for kinetoscopesand for other analogous purposes.

The object of the invention is to provlde an efficient apparatus adaptedto reflect practically the entire amount of light ra s einanating from alamp into the re ract1ng lenses. At the present time in movmg pictureprojection apparatus an electric arc lamp is employed from which butlittle more than the direct pencils of light to the lenses are utilizedand thrown upon the screen, with the result that an intensely stronglamp must be employed with relatively large consumption of current andhigh cost of operation. In my invention I employ a lamp of much lowerlighting efficiency and consumption of current, but by inclosing suchlamp in a substantially globular casing having light reflecting anddirecting interior surfaces, I am able to concentrate at least an equalintensitg of light upon the lenses from a lamp unit and economy in largemeasure.

The invention consists in the novel construction of a light reflectingcasing and the combination and adaptation therewith of devices for itsventilation, as ,will be full explained in the following specification,lllllS- trated in the accompanying drawings, and finally set forth inthe appended claims.

In said drawings, Figure 1 is a longitudinal sectionalview of apparatusembodying my invention. Fig. 2 is a transverse sectional view through2-2 of Fig. 1. Figs. 3 and 4 are respectively views in side elevationand top plan of a detail of the invention drawn to an' enlarged scale.

eferring to said views, the reference numeral 1 designates an" electriclamp of any suitable form, that type known as nitrogen lamps being nowconsidered to be desirable in connection with my im rovements. Said lampis shown and may e provided with 'a socket 2 which is fixedly positionedwithin a tubular sleeve 3 arranged axially of a reflector-casing 5. Saidcasing 5 is of concavo-convex form, its converging reflectaving theadvantages of portabilityv ing surface 5 extending in forward directionswith said lamp in its axial line and is desirably of elliptic interiorconfiguration having its foci in the center face of the re fractinglenses hereinafter described and the center of light C which is in thetransverse plane of the perimetrical extremity 6 of said reflector 5.

vDetachably secured to said reflector casing 5 is a reversehemispherical reflector 7 of concavo-convex form which has for thecenter of its converging interior reflecting surface 7 the center oflight 0 of said lamp. Said reflector 7 is arranged at its rearward edges8 to overlap the forward edges 6 of said reflector 5 and -is spacedoutwardly therefrom afi'ording an annular space 10 therebetween. Spacedat equi-distant intervals as at 90 degrees apart about said reflector 5are radially disposed studs 11 each having a reduced portion 12 neartheir outer extremitiesand a head 13. The reflector 7 is provided withcorrespondingly spaced L- shaped slots 15 in which said reduced portion12 of the respective studs are received to secure the reflectors 5 and 7together. "One or more spring clips 16 are adapted to overlap said slotsand by engagement with the head 13 of said stud retain the latter indetachable locked condition.

Arranged axially of said reflector 7 and in alinement with said lamp andthe socket 3 is an opening into which is secured a tubular shell 17 intowhich a lens casing 18 is telescopically fitted for adjustment toward oraway from said lamp. Said casing 18 is provided with plano-convex lenses20 and 21 adapted to direct the pencils of light reflected thereintoinparallel rays. Surrounding that portion of said shell 17 directlyadacent saidlenses is an annular cooling chamber 22 into which a currentof cooling air is directly blown through inlet pipe 23 to which aflexible or other conduit (not shown) may be communicatively connectedthrough which a current of air is blown by a fan or blower (not shown),and which is exhausted from said chamber 22 into the lamp compartment 23through aperture 25 in said reflector 7 arranged in spaced rela tionabout said lens casing 18. Such air currents are thus circulated aboutthe lens casing 18 and then are directed toward the lamp carrying awayfrom the lenses any excess heat received from said lamp and whichfinally finds exit through the annular passage 10 and through aperture26 in the reflector 5 and spaced about the sleeve 3 in a similar mannerto the arrangement of the aperture 525.

From the foregoing description and by reference to Fig. 1' whereinangles of incidence and reflection of the pencils of light emitted fromthe lamp are graphically shown by lines and darts, the functions of saidreflecting surface will be understood. As described, the reflectingsurface 5 of the reflector 5 directs all rays of light received thereonto the lens 20 while the reflecting surface 7 redirects light raysreceived thereon back to said center of light C whence it is transmittedto the surface 5 and. thence to the lens 20. Thus it will be seen thatpractically all the light rays from the lamp will eventually be directedto the lenses save a small portion that will be lost in the base andsocket of the lamp.

A relatively low-powered lamp may thus be used to obtain a beam of lightof great intensity and the lamp may be practically fully inclosed tointercept the amount of light by the provision of forced air supply andexhaust as indicated. The provision of a readily demountablereflector-casing is likewise of considerable merit whereby the lamp maybe positioned and replaced without difliculty or delay.

Having described my invention, what I claim is,-

1. In a reflecting apparatus, a reflector arranged to direct all lightrays incident thereon in forward direction to a single focus, andanother reflector adapted to direct the light rays incident thereonrearwardly upon said first named reflector, said second named reflectorarranged to overlap said first named reflector and spaced therefrom toprovide an annular opening thereabout.

2. In a reflecting apparatus, a reflector arspaced annular openingthereabout, and detachable connections between said reflectors.

3. In a reflecting apparatus, a reflector arranged to direct all lightrays incident thereon in forward directions, a lamp extending forwardlyin the axial line of said reflector, a second reflector dctachablyconnected to said first named reflector and adapted to divert all raysof light incident thereon reversely upon said first named reflector, and

from the latter in overlapped relation to afford an annular openingtherebetween, the center of the source of light of said lamp being inthe transverse plane of the forward perimetrical edge of said firstnamed reflector.

4:. In a reflecting apparatus, a two-part reflector-casing having a lampextending forwardly from the rearmost said part in axial directiontherein, and a lens casing in the foremost said reflector part havingits tubular bore arranged in axial alinement with said lamp, the partsof said reflector casing being arranged in overlapped relation with theforemost part outermost affording an annular opening therebetween, anannular chamber surrounding said lens casing having openings into saidreflector-casing, and means for supplying a current of air into saidchamber exhausting into said reflectorcasing.

Signed at Bremerton, Wash, this 24 day of June, 1915.

A. L. CROXTON.

Witness 13mm 0. Anno'rr.

